From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sam Ravnborg Date: Sun, 16 Apr 2006 14:03:59 +0000 Subject: Re: [PATCH 00/05] robust per_cpu allocation for modules Message-Id: <20060416140359.GA15091@mars.ravnborg.org> List-Id: References: <1145049535.1336.128.camel@localhost.localdomain> <4440855A.7040203@yahoo.com.au> <4441B02D.4000405@yahoo.com.au> <17473.60411.690686.714791@cargo.ozlabs.ibm.com> <1145194804.27407.103.camel@localhost.localdomain> In-Reply-To: <1145194804.27407.103.camel@localhost.localdomain> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: Steven Rostedt Cc: Paul Mackerras , Nick Piggin , LKML , Andrew Morton , Linus Torvalds , Ingo Molnar , Thomas Gleixner , Andi Kleen , Martin Mares , bjornw@axis.com, schwidefsky@de.ibm.com, benedict.gaster@superh.com, lethal@linux-sh.org, Chris Zankel , Marc Gauthier , Joe Taylor , David Mosberger-Tang , rth@twiddle.net, spyro@f2s.com, starvik@axis.com, tony.luck@intel.com, linux-ia64@vger.kernel.org, ralf@linux-mips.org, linux-mips@linux-mips.org, grundler@parisc-linux.org, parisc-linux@parisc-linux.org, linuxppc-dev@ozlabs.org, linux390@de.ibm.com, davem@davemloft.net, rusty@rustcorp.com.au On Sun, Apr 16, 2006 at 09:40:04AM -0400, Steven Rostedt wrote: > The per_cpu variables are defined with the macro > DEFINE_PER_CPU(type, var) > > This macro just places the variable into the section .data.percpu and > prepends the prefix "per_cpu__" to the variable. > > To use this variable in another .c file the declaration is used by the > macro > DECLARE_PER_CPU(type, var) > > This macro is simply the extern declaration of the variable with the > prefix added. Suprisingly this macro shows up in ~19 .c files. Only valid usage is forward declaration of a later static definition with DEFINE_PER_CPU. arch/m32r/kernel/smp.c + arch/m32r/kernel/smpboot.c is jsut one example. Just a random comment not related to Steven's patches. Sam